Ri and Kim attended a performance by the Moranbong Band on Monday, which marked the 60th anniversary of the founding of the Kim Il Sung Military University, according to the North's Korean Central News Agency (KCNA).
Ri had not appeared in public since Sept. 8, leading to speculation she could be pregnant or the communist nation's military leaders disapproved of her active public role.
After being first introduced by the North Korean media as the first lady in late July, the 23-year-old woman had often been spotted accompanying her husband on inspection trips across the country till early September.
"Our supreme leader and the head of the state, Kim Jong-un appeared in the auditorium with his wife and comrade Ri Sol-ju. A windstorm of hooray instantly burst out," the KCNA noted.
Ri's media return came one day after the KCNA reported Kim Jong-un's visit to the prestigious university on Monday.
It was also Kim's first reported public appearance since he was last seen on North Korean media on Oct. 14, attending an establishment anniversary of other colleges.
The couple also watched a national sports competition with Kim highlighting the need to increase support to promote physical training.